In the form of problems are presented the physics of weakly ionized gas. The properties of weakly ionized plasma associated with the formation, destruction and movement of charged particles and plasma oscillations, as well as the electrical and magnetic properties of plasma. The transfer of radiation in a weakly ionized gas is considered. The physical kinetics of processes occurring in weakly ionized plasma and gas is presented . The previous edition was published in 1978. The book is designed for senior students of physical and physico-technical faculties and graduate students specializing in the field of plasma.